Electrical insulating device having a terminal thereon and a method of making it



1934- H. SCHWARTZMANN 1,984,056

ELECTRICAL INSJJLATING DEVICE HAVING A TERMINAL THEREON AND A METHOD MAKING IT Filed Oct. 12. 52

FIG. 4

INVENTOR H. SCI-Hm R TZMANIV A TTOR/VEY Patented Dec. 1 1,

UNITED STATES PATENT OFFICE The invention relates OF MAKING IT Harry Schwartzmann, New York, N. Y assignor to Western Electric Company, Incorporated, New York, -N. Y., a corporation of New York Application October 12,1932, Serial No. 637,497

9 Claims. (CL 175-21) to an electrical insulating device having a terminal thereon and a method of makingit, and more especially to the manufacture of an insulating spool structure with terminals thereon, upon which an electrical winding can be readily applied and the ends thereof secured to the to rminals.

angles to the shelf like ridges extending within extensions and integral the slots. The desired number of flat terminals having recesses on the inner and outer sides thereof are then assembled into predetermined slots so that they extend through the extension orflange and so that the recesses on the inner side engage the slots. Heat and pressure is then applied to the extensions or flanges to cause the material to flow toward the terminals and closely engage the outer surfaces of the terminals and the recesses in the outer surfaces to secure the terminals therein.

In another preferred embodiment the extension or flange is provided with an outer channel extending parallel to the extension or flange, the channel being shaped similar to the recesses in the terminals. After the terminals are assembled in the slots a clamping strip of suitable insulating material having its inner face shaped similar to the recesses in the place in the channel.

Other objects and adv terminals is secured in antages of the invention will more fully appear from the following description taken in connection with the accompanying drawing wherein,

Fig. 1 is a perspective view of a preferred embodiment of a spool having projecting portions with slots therein for receiving winding terminals;

Fig. 2 is a perspective bodiment of a terminal shown in Fig. 1;

Fig. 3 is a perspective view of a preferred'emfor use with the spool view of a portion of one of the spool heads shown in Fig. 1 with the terminals shown in Fig. 2 secured in the slots;

Fig. 4 is a cross sectional 4--4of Fig.3; g. 5 is a cross secti view taken along the onal view of one means for securing the terminals in place in the spool heads shown in Fig. 3;

Fig. 6 is a'perspective view of a portion of a spool head with the-terminals shown in Fig. 2 secured therein inaccordance with another embodiment of the invention;

Fig. 7 is a perspective view of a portion of a spool head and terminals in accordance with another embodiment of the invention;

Fig. 8 is a cross sectional view taken along the line 8-8 of Fig. 7;

Fig. 9 is a plan view of an embodiment of a terminal for use in the embodiment shown in Fig. 10, and

Fig. 10 is a perspective view of a portion of a spool head in accordance with another embodiment of the invention.

In a preferred embodiment of an insulating device having terminals thereon, as shown in Figs. 1 to 5 inclusive,the spool 11 is formed or molded of insulating material of any suitable kind, such for example, as rubber, a cellulose acetate compound, a shellac compound, or other thermal plastic materials or compounds. The heads 12 are formed integral with the core 13. The core 13 is hollow so that if desired a magnetic core of any suitable kind (not shown) can be assembled therethrough after the winding (not shown) has been applied on the spool. Each of the heads 12 have an integral outwardly projecting shelf like extension or flange 14 with a plurality of deep narrow slots 15 at right angles to the shelf like extension or flange 14 and integral ridges 16 (Fig. 4) extending within the slots.

The terminals 17 are provided with an inner recess 18 and an outer recess 19, the inner recess 18 being so contoured as to engage the ridges 16 and so located that when the terminals 1'1 are assembled in the slots 15 with the inner recess 18 in engagement with the ridges 16, the lower ends of the terminals 17 extending below the shelf extension or flange 14 to permit fastening the leads from the winding (not shown) thereto and the upperends of the terminals 17 extend above the shelf like extension or flange 14 to permit fastening external conductors (not shown) thereto.

After the terminals 17 are properly assembled in the'slots 15 a heated pressing implement 50 (Fig. 5) having spaced ridges 51 extending parallel to the slots 15 is applied to the shelf like extension or flange 14 to cause the insulating material to flow toward the terminals 17 and closely engage the outer surfaces of the terminals 17 and close the outer surfaces of the recesses 19 to setreated on the same press it may be desirable to cure the terminals therein. Preferably the heated pressing implement has a single spaced ridge 51 extending directly over each of the slots 15 as shown in' Fig. 5 so that the material is forced directly into the outer portions of the slots 15. In some instances, especially where a large number of different types of spoolassemblies are to be omit the .ridges 51 from the implement 50 and press-the entire surface of the extension or flange 14.

In a preferred embodiment of the invention as shownin Fig. 6 the outwardly projecting shelf like extension or ledge 14 of each of the heads 12 is provided with an outer channel 61 extending parallel to the extension or ledge 14, the channel 61 being shaped similar to the outer recesses 19 of the terminals 1'7. .After the desired number of terminals 17 are inserted in the desired slots 15, a clamping strip 62 of suitable insulating material and having its innerface 63 shaped similar to the outer recesses 19 of the terminals 17 is secured in place in the channel 61' by any suitable means such as screws 64.

In another preferred embodiment shown in Figs. 7 and 8 the retaining orclamping strip 72 which fits into the channel'71 is made of a thermal plastic compound or a partially cured insulating compound and is secured in place by applying heat and pressure to" the ledge 14 and the clamping strip 72 to further cure the clampstrip 72' and securely hold the terminals 17 in place.

When the width of the shelf like extension or ledge 14 is suflicient, as shown in Figs. 7 and 8 to permit the use of a clamping strip '72 having a width at least as great as its depth, the clamping strip may be made of any suitable insulating material and may be held in place in the channel '11 by means of suitable cement.

In another preferred embodiment as shown in Figs. 9 and 10 the terminals 91 have circular holes 92 therein. The outward projecting shelf like extensions or ledges 14 of the spool heads 12 are provided with vertical slots 93 during the molding operation which extends through the extension or ledge 14, the outer ends of the slots 93 in the extension or ledge 14 being closed. Holes 14 parallel thereto. The terminals 91 are as- 94 are drilled through the extensions or ledges sembled in position in the desired slots 93 and rods .95 of insulating material are ed through like extension or flange than unused projecting- Y the holes 94 in the ledges 14 andthrough the holes 92 in the terminals 91 to securely lock the terminals, in place.

. The above described method of constructing a spool assembly has several important advantages core,'and, second it provides a spool assembly which can be made with a single simple mold and in which different numbers of terminals can be later assembled in various positions, there being less objection to having unused slots in the shelf terminals on a completed coil.

The invention is also capable of other modifications and adaptations not specifically referred to but included within the scope of the appended claims. v

What is claimed is:

1. In a spool for receiving a winding for an electrical device, a spool head of insulating material having an integral outwardly projecting shelf like extension with a plurality of deep clamping strip in said channel for engaging with the recess in' the outer side of each of said terminals to secure said terminals in the slots in said shelf like extension.

2. In .a spool for receiving a winding for an electrical device; a core and a pair of spool heads of insulating material integral therewith, each of said spool heads having an integral outwardly projecting shelf like extension with a plurality of deep narrow open slots therein at right angles tosaid shelf like extension, an outer channel extending in said shelf like extension and parallel thereto for the entire length thereof, ridges integral with said extension extending from the inner sides of the slots and within the slots, a plurality of flat terminals assembled in said slots and'extending above and below said extension and each having a recess in the inner side thereof for engaging with the ridges in said slots, and another recess in the outer side thereof, the outer side of each. of said terminals and the recess in the outer side thereof being within the deep narrow slots, and a clamping strip in said channel for engaging with the recess in the outer side of each of said terminals to secure said terminals in the slots in said shelf like extension.

3. The method of producing a molded spool of insulating material for receiving windings re-' quiring different numbers of terminals or terminals in different locations which comprises forming a pair of heads each having an integral outwardly projecting shelf like extension with a plurality of slots therein at right angles to the shelf like extension and with ridges integral with said extension extending within the slots, assembling the required number of terminals having recesses therein in their respective predetermined slots with the recesses in engagement with the ridges in the slots, applying heat and pressure to narrow strips of the insulating material parallel to the slots to cause the maeng'age the outer edges thereto.

4. In aspool for receiving a winding for an electrical device, a core and apair of spool heads of insulatingmaterial integral therewith,

one of said spool heads having an integral outwardly projecting shelf like extension with a plurality of verticaPslots therethrough and a hole therethrough intersecting with the slots and parallel to the extension. a plurality of flat terminals each having a hole therethrough assembledin said slots and extending through said extension, and a rod of insulating material extending through the hole in the ledge and the holes in the terminals to securely lock the terminals in place.

5. In a spool for receiving a winding for an electrical device, a head of insulating material terial to flow toward the terminals and closely] having an integral outwardly projecting shelf like extension with a plurality of deep narrow slots therein at right angles to said shelf like extension, and a plurality of flat terminals, each having a portion thereof cut away, assembled in said slots and extending through said extension, and means engaging with the terminals on the surface thereof where the portion has been cut away to secure said terminals in place, said terminals adapted to be assembled in said spool head after said slots and ridges have been formed.

6. In a spool for receiving a winding for an electrical device, a core and a pair of spool heads integral therewith all of insulating material, one of said headshaving an integral outwardly projeeting shelf like extension comprising a plurality of alternating lugs and slots, the lugs being formed to receive and support a terminal retaming member, a plurality of terminals each positioned within one of the slots, and a terminal retaining member received in and supported by the lugs to hold the terminals in place.

7. In a spool for receiving a winding for an electrical device, a core anda pair of spool heads integraltherewlth all of insulating material, one of said heads having an integral outwardly projeeting shelf like extension comprising a plurality of alternating lugs and slots, the lugs being formed to receive and support a terminal retaining member, a plurality of terminals each positioned within one of the slots and each formed to coact with a terminal retaining member, and a terminal retaining member received in and supported by the lugs to hold the terminals in place.

8. In a spool for receiving a winding for an electrical device, a core and a pair of spool heads integral therewith all of insulating material, one of said heads having an integral outwardly projecting shelf like extension comprising a plurality of alternating lugs and slots, the lugs being formed with slots to receive and support a terminal retaining member, a plurality of terminals each positioned within one of the slots and each slotted to coact with a terminal retaining memher, and a terminal retaining member received in and supported by the lugs to hold the terminals in place.

9. In a spool for receiving a winding for an electrical device, a core and a pair of spool heads integral therewith all of insulating material, one of said heads having an integral outwardly projecting shelf like extension comprising a plurality of alternating lugs and slots, the lugs being formed with perforations to receive and support a terminal. retaining member, a plurality of terminals each positioned within one of the slots and each perforated to coact with a terminal retaining member, and a terminal retaining member received in and supported by the lugs to hold the terminals in place.

HARRY SCHWARTZMANN. 

